This counter tracks the number of BGREJ (Begin Reject) PDUs transmitted on this port, per the description, sent when this port explicitly refuses a far end's request (BGN) to establish the SSCOP signaling link. Since an outright rejection of link establishment is unusual outside of misconfiguration or version mismatch, any nonzero value here is worth investigating -- for example a UNI version mismatch (recall svcAtmConfigQSaalTIdle's UNI 3.1-specific behavior) between this port and its peer is a classic cause of BGREJ. This counter essentially flags configuration incompatibility rather than transient link noise.